I have two M&P's, one with an Eotach 512.A651 and the other with an Aimpoint Comp M. Out to 50 yards, I like the Eotach but past that is where the Aimpoint shines so it really depends on what type of shooting you plan to do. Word of advice is to buy quality up front so you don't end up with a box full of Eotach or AImpoint "ripoffs". Lot's of options so do your homework and spend wisely!!